Science Quiz

Use the information and your knowledge of science to answer the question. Daniel was playing with a glow stick and noticed that something inside the glow stick seemed to break when he bent it. He researched how a glow stick works and found this information. What causes the glow stick to produce light?

• A new material is formed when the glass mixes with Chemical W.

• A new material is formed when the glow stick's temperature changes.

• A new material is formed when Chemical X and Chemical W are shaken.

• A new material is formed when Chemical X mixes with Chemical W.

Which evidence best supports how you know what type of reaction making a glow stick is?

• The glow stick is brighter in cold temperatures.

• The glass capsule is broken and cannot be fixed.

• The glow stick produces light after the two chemicals are mixed.

• The two chemicals are separated inside a solid container.

Which statement best explains how a chemical change has happened?

• New substances are formed.

• Solution A becomes a solid.

• The solid is heavier than the liquids.

• Stirring makes the temperature of the liquids change.

Heating substances can lead to the formation of new substances that can be identified by their new properties. Choose the details below that supports the claim with evidence.

• Condensation forms on the outside of a can of soda after taking it out of the refrigerator. The water vapor changed state from gas to liquid when it got cold.

• While heating a piece of bread, a gas was released (steam), there was a new odor, and the bread turned black.

• After leaving a cup of crayons in the car, the crayons melted into a liquid.

• After cooking an egg, it changed from liquid to solid, and it changed from clear to white. The cooking egg produces an odor, which is a gas.

When mixing two unknown substances, which of the following signs would indicate a chemical reaction has occurred?

• The volume of the combined substance is equal to the first substance added to the second substance.

• The combined substance color looks like a combination of the two substances.

• The mass of the combined substance is equal to the first substance added to the second substance.

• The combined substance immediately increased in temperature.

A student noticed fizzing and bubbling. The beaker also felt warm to the touch. Which of the following best describes what happened?

• A mixture was formed.

• A solution was formed.

• A physical change occurred.

• A chemical change occurred.

Which of the following is an example of a chemical change?

• Melting ice

• Burning wood

• Boiling water

• Dissolving sugar

Students were completing a lab in class. The teacher told them to mix two unknown liquids to see if a new substance would be formed. Which of the following would not be evidence that a new substance was formed?

• A white solid was formed.

• It became extremely hot very quickly.

• The liquids mixed evenly.

• The liquid changed color.

Which of the following properties would Londyn want to keep in mind about the two substances when deciding how to separate them? Select the two correct answers.

• color

• smell

• size

• attraction to other molecules

• shape

What is one process Londyn could do to separate the salt and sand mixture?

• Filtration

• Evaporation

• Magnetic separation

• Distillation